# -*- mode: python -*-
###
#
# (c) 2000-2007 Wijnand Modderman <wijnand at tehmaze dot com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

__revision__ = '$Hg:$'

# system imports

# DDB imports
from ddb.log import log
from ddb.decorator import decorator

def AccessException(Exception):
    pass

# this is a decortor that allows you to specify access to the specified
# module module call

def access(globalFlags, localFlags):
    def call(proc, self, event, *args, **kwargs):
        print "ACCESS", proc, self, event, globalFlags, localFlags
        access = False
        # if no rights are set, access granted
        if not globalFlags and not localFlags:
            access = True
        # if local flags are set, if user matches these, allow
        if not access and localFlags:
            flags = event.user.rights(event.target)
            if not flags:
                return
            for flag in flags:
                if flag in localFlags:
                    access = True
        # if global flags are set, if user matches these, allow
        if not access and globalFlags:
            flags = event.user.rights('*')
            if not flags:
                return
            for flag in flags:
                if flag in globalFlags:
                    access = True
        if access:
            return proc(self, event, *args, **kwargs)
        else:
            raise AccessException, "access denied"
    return decorator(call)

# vim:ts=4:sw=4:et:
